I've used Wesley's and A2Z
Both I thought work very similar and I was happy with both performances.
But its really necessary to use a brush and some major elbow grease. I know when I did my mother's Explorer a few weeks ago, 1 tire I spent a good amount of time on brushing and brushing and then some more brushing and the tire looked great, the other 3 tires, I was too tired and made 1-2 passes with the brush and there is a noticable difference between the 3 tires and the 1 I spent a lot of effort on
My one gripe about Wesley's though is the damn bottle and sprayer, they suck at best. The bottle is an odd rectangle shape and the sprayer requires you to use one finger. Its a real PITA if you use it
